[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.956141][ T6526] general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN [ 74.967899][ T6526] KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [ 74.976300][ T6526] CPU: 0 PID: 6526 Comm: syz-executor566 Not tainted 5.16.0-rc3-syzkaller #0 [ 74.985051][ T6526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.995096][ T6526] RIP: 0010:__lock_acquire+0xd7d/0x54a0 [ 75.000658][ T6526] Code: 10 0e 41 be 01 00 00 00 0f 86 c8 00 00 00 89 05 99 6c 10 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 f3 2f 00 00 48 81 3b 20 15 18 8f 0f 84 52 f3 ff [ 75.020255][ T6526] RSP: 0018:ffffc9000292f818 EFLAGS: 00010006 [ 75.026321][ T6526] RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 [ 75.034280][ T6526] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001 [ 75.042238][ T6526] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 75.050207][ T6526] R10: 0000000000000000 R11: 000000000000000a R12: 0000000000000000 [ 75.058180][ T6526] R13: ffff88801a94d700 R14: 0000000000000000 R15: 0000000000000001 [ 75.066142][ T6526] FS: 00007f4742b7a700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 75.075063][ T6526] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.081637][ T6526] CR2: 00007f4742b58268 CR3: 000000006ee6c000 CR4: 00000000003506f0 [ 75.089600][ T6526] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 75.097560][ T6526] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 75.105526][ T6526] Call Trace: [ 75.108799][ T6526] [ 75.111724][ T6526] ? __lock_acquire+0x162f/0x54a0 [ 75.116756][ T6526] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 75.122748][ T6526] ? mark_lock+0xef/0x17b0 [ 75.127254][ T6526] lock_acquire+0x1ab/0x510 [ 75.131757][ T6526] ? finish_wait+0xc0/0x270 [ 75.136344][ T6526] ? lock_release+0x720/0x720 [ 75.141015][ T6526] ? find_held_lock+0x2d/0x110 [ 75.145777][ T6526] ? inet_csk_accept+0x3e1/0x9d0 [ 75.150735][ T6526] ? _raw_spin_lock_irqsave+0x4e/0x50 [ 75.156102][ T6526] _raw_spin_lock_irqsave+0x39/0x50 [ 75.161306][ T6526] ? finish_wait+0xc0/0x270 [ 75.165810][ T6526] finish_wait+0xc0/0x270 [ 75.170135][ T6526] inet_csk_accept+0x7de/0x9d0 [ 75.174897][ T6526] ? reqsk_put+0x2f0/0x2f0 [ 75.179311][ T6526] ? release_sock+0x1b/0x1b0 [ 75.183908][ T6526] ? finish_wait+0x270/0x270 [ 75.188495][ T6526] mptcp_accept+0xe5/0x500 [ 75.192920][ T6526] inet_accept+0xe4/0x7b0 [ 75.197239][ T6526] ? rwlock_bug.part.0+0x90/0x90 [ 75.202170][ T6526] ? inet_sock_destruct+0x880/0x880 [ 75.207376][ T6526] ? __local_bh_enable_ip+0xa0/0x120 [ 75.212659][ T6526] mptcp_stream_accept+0x2e7/0x10e0 [ 75.217870][ T6526] ? do_raw_spin_unlock+0x171/0x230 [ 75.223206][ T6526] ? mptcp_subflow_delegate.constprop.0+0x440/0x440 [ 75.229809][ T6526] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.236051][ T6526] do_accept+0x382/0x510 [ 75.240307][ T6526] ? __ia32_sys_listen+0x70/0x70 [ 75.245249][ T6526] ? rwlock_bug.part.0+0x90/0x90 [ 75.250197][ T6526] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 75.256439][ T6526] ? _find_next_bit+0x1e3/0x260 [ 75.261291][ T6526] ? do_raw_spin_unlock+0x171/0x230 [ 75.266490][ T6526] ? _raw_spin_unlock+0x24/0x40 [ 75.271334][ T6526] ? alloc_fd+0x2f0/0x670 [ 75.275661][ T6526] __sys_accept4_file+0x7e/0xe0 [ 75.280533][ T6526] __sys_accept4+0xb0/0x100 [ 75.285032][ T6526] __x64_sys_accept+0x71/0xb0 [ 75.289715][ T6526] ? syscall_enter_from_user_mode+0x21/0x70 [ 75.295692][ T6526] do_syscall_64+0x35/0xb0 [ 75.300105][ T6526] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 75.305995][ T6526] RIP: 0033:0x7f4742bc88e9 [ 75.310398][ T6526] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 75.330004][ T6526] RSP: 002b:00007f4742b7a308 EFLAGS: 00000246 ORIG_RAX: 000000000000002b [ 75.338407][ T6526] RAX: ffffffffffffffda RBX: 00007f4742c50408 RCX: 00007f4742bc88e9 [ 75.346366][ T6526] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 75.354334][ T6526] RBP: 00007f4742c50400 R08: 0000000000000000 R09: 0000000000000000 [ 75.362293][ T6526] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4742c5040c [ 75.370425][ T6526] R13: 00007f4742c1e004 R14: 6d705f706374706d R15: 0000000000022000 [ 75.378392][ T6526] [ 75.381481][ T6526] Modules linked in: [ 75.385363][ T6526] ---[ end trace 42264e8ebb5e561f ]--- [ 75.390802][ T6526] RIP: 0010:__lock_acquire+0xd7d/0x54a0 [ 75.396357][ T6526] Code: 10 0e 41 be 01 00 00 00 0f 86 c8 00 00 00 89 05 99 6c 10 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 f3 2f 00 00 48 81 3b 20 15 18 8f 0f 84 52 f3 ff [ 75.415954][ T6526] RSP: 0018:ffffc9000292f818 EFLAGS: 00010006 [ 75.422008][ T6526] RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 [ 75.429969][ T6526] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001 [ 75.437944][ T6526] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 75.445902][ T6526] R10: 0000000000000000 R11: 000000000000000a R12: 0000000000000000 [ 75.453859][ T6526] R13: ffff88801a94d700 R14: 0000000000000000 R15: 0000000000000001 [ 75.461816][ T6526] FS: 00007f4742b7a700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 75.470739][ T6526] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.477330][ T6526] CR2: 00007f4742b58268 CR3: 000000006ee6c000 CR4: 00000000003506f0 [ 75.485306][ T6526] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 75.493272][ T6526] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 75.501241][ T6526] Kernel panic - not syncing: Fatal exception [ 75.507348][ T6526] Kernel Offset: disabled [ 75.511656][ T6526] Rebooting in 86400 seconds..